Module ngx_http_random_index_module

The ngx_http_random_index_module module processes requests
ending with the slash character (‘/’) and picks a random
file in a directory to serve as an index file.
The module is processed before the
ngx_http_index_module
module.

This module is not built by default, it should be enabled with the
--with-http_random_index_module
configuration parameter.